MLA

Montagu, Charles, Duke of Manchester, 1660?-1722. James Vernon to the E of M on the Partition Treaty, and on the project for placing a French Prince on the throne of Spain. (Partly in cipher, with decipher on fly-leaf. Printed, with some variations, in Cole's Memoirs, p. 248) Whitehall. Box 5, folder 56. 1700 Nov 18. https://collections.library.yale.edu/catalog/16601197.

APA, 6th edition

Montagu, Charles, Duke of Manchester, 1660?-1722. (["Box 5, folder 56"])(1700 Nov 18)[James Vernon to the E of M on the Partition Treaty, and on the project for placing a French Prince on the throne of Spain. (Partly in cipher, with decipher on fly-leaf. Printed, with some variations, in Cole's Memoirs, p. 248) Whitehall]. https://collections.library.yale.edu/catalog/16601197.